DataFrame在某一列中取符合条件的值，实例为在时间列中取出小于10的值。

import numpy as np
import pandas as pd

df = pd.read_csv(r'C:/Users/hanhan/PycharmProjects/pythonProject/data.csv',encoding = 'gbk')

t = np.array(df['时间'])
print('初始值的t=',t)
t = np.array(df[df['时间']<10]['时间'])
print('筛选后的t=',t)